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प्रश्न
Find the odd one out and give its explanation.
विकल्प
Zinc coating
Tinning
Electroplating
Calcination
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उत्तर
Calcination
Explanation-
Calcination is a process involved in extraction of carbonate ores while others are methods used for prevention of corrosion.
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संबंधित प्रश्न
Give reasons.
Aluminium is a highly reactive metal, yet it is used to make utensils for cooking.
Name a reducing agent that may be used to obtain manganese from manganese dioxide.
Silver metal does not combine easily with oxygen but silver jewellery tarnishes after some time. How?
How is manganese extracted from manganese dioxide, MnO2? Explain with the help of an equation.
A zinc ore on heating in air forms sulphur dioxide. Describe briefly any two stages involved in the conversion of this concentrated ore into zinc metal.
Name the chemical compound which is electrolysed in molten state to obtain sodium metal. Which gas is produced in this process?
What is the difference between a mineral and an ore?
The metal which can be extracted from pyrolusite ore is:
(a) mercury
(b) manganese
(c) aluminium
(d) magnesium
Give reasons, why aluminum is used in:
making alloys
Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
Why is powdered coke sprinkled on top of the electrolyte?
Which method of refining is used to get 99.8% pure aluminium?
Write equations for each of the above metal which reacts with water.
Complete the incomplete statement with missing words:
Metals are ______ while non-metals are ______ conductors of heat.
Complete the incomplete statement with missing word:
Metals are malleable while non-metals are ______.
Write the molecular formulae of the following compound.
Fluorspar
Explain the following reaction with the balanced equation.
Zinc oxide is treated with carbon
Observe the following diagram and write answers.
- Name the method.
- Write anode reaction and cathode reaction.
- Why fluorspar and cryolite are added in the mixture?
The given reaction shows one of the processes to extract the metals like Iron and Manganese.
\[\ce{MnO2(s) + Al(s) -> Mn(l) + Al2O3(s) + Heat}\]
Give the reason why the above reaction is known as a thermite reaction.
Assertion (A): The extraction of metals from their sulphide ores cannot take place without roasting the ore.
Reason (R): Roasting converts sulphide ores directly into metals.
